JPH0641692B2 - Sand cover device on the bottom of the water - Google Patents

Description

[Technical Field of the Invention] The present invention, when performing sand-covering work for organic sludge on the bottom of the water, softly lands the sand near the bottom of the water and has a uniform and arbitrary thickness. The present invention relates to a sand-covering device on a water bottom for enabling sand-covering work.

[Prior art]

Conventionally, in order to cover the sludge-like organic sludge on the bottom of the water, sand is sprinkled on the bottom of the water from a sand cover boat on the surface of the water.However, when the sand is sprinkled, the sand falls onto the sludge. The sludge floats up and pollutes the surrounding area, and heavy sand falls on the sludge with low strength.The sludge and sand are replaced, and the improvement effect on the soft ground does not rise, and a large amount of sand is consumed. There was a problem of doing.

[Object of the Invention]

The present invention has been made in order to solve the above-mentioned conventional problems, while softly landing sand on a soft water bottom, and covering sand on the water bottom that enables construction of sand with a uniform thickness. The purpose is to provide a device.

[Structure of Invention]

The sand-covering device for a water bottom of the present invention to achieve the above object is movable while maintaining a substantially constant distance from the water bottom by a ladder extending from the sand-covering ship on the water surface toward the water bottom. Slurries consisting of sand and water from sand pipes extended from a sand-covered ship can be jetted to face each other on the side surface of the spray box provided with a steel plate box or the like having a bottom opening. Both of them are provided with a pair of diffusion ports, and a mesh portion composed of a mesh body or the like laminated in multiple stages is provided on the lower side portion and the side surface portion of the bottom opening portion of the spreading box.

In the sand-covering device having the above-mentioned configuration, the slurry consisting of sand and water is jetted from the diffusion ports provided on both sides of the spreading box, hits each other, is stirred, and is stirred in the spreading box. After being diffused to a uniform concentration, it will softly land on the bottom of the water while passing through the mesh parts provided on the lower side of the bottom opening and the side parts of the bottom opening, and it will be covered with sand with a uniform thickness. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 is a side view of a sand-covered ship equipped with the sand-covering device according to the present invention.
FIG. 3 is a side sectional view of a sand-covering device on the bottom of the water in one embodiment of the present invention, FIG. 3 is a plane sectional view in the II direction of FIG. 2, and FIG. 4 is a II-II direction of the FIG. FIG.

First, as shown in FIG. 1 to FIG. 4, the sand covering device swings in the left-right direction L-R from the sand-covering ship 15 on the water surface W toward the water bottom surface B, and the vertical directions U and D. Is provided so as to be movable by moving the sand-covering vessel 15 in the direction of arrow F while maintaining a substantially constant distance H from the water bottom surface B from the tip of the ladder 6 extended so as to be tiltable. It consists of a spreading box 1 having a bottom opening 10, and this spreading box 1
Sand S is sent from the sand pump on the sand-covering ship 15 via the sand pipe 7.
Sand pipe 2 for branching in from the both sides of the spreading box 1
And the stirring portion 3, the mesh portion 4 on the lower side portion of the bottom opening portion 10 and the mesh portion 5 on the side surface portion thereof, and the sprinkling box 1 itself can move in the water by the ladder 6 as described above.

Next, the slurry consisting of the water S and the sand S sent together with water in the sand feeding pipe 7 by the sand feeding pump on the sand-covering ship 15 is branched at the branching portion 8 and passes through each sand feeding pipe 2. , A pair of diffusing ports 9 capable of jetting while facing each other while diffusing the water flow are jetted symmetrically from both sides in the spray box 1 to the stirring section 3.

As described above, each water flow of the slurry of sand S and water ejected from each of the facing diffusion ports 9 collides in the spray box 1 to generate a stirring effect in the stirring section 3, so that the spray box 1 has a uniform concentration. The sand S diffuses and collides with the mesh portions 4 provided on the lower side portion and the side surface portion of the bottom opening 10, and the diffused sand S loses its velocity and settles on the water bottom surface B with a uniform concentration.

On the other hand, the mesh portion 5 provided on the side surface portion of the mesh portion 4 mainly has a function of preventing an influence of water resistance at the time of movement of the external water flow and the spreading box 1.

Further, the spreading box 1 always keeps the distance H from the water bottom surface B constant by the tilting operation of the two-stage ladders 6A and 6B equipped with the hydraulic cylinder 11 and the hydraulic cylinder 12 in the arrow X direction and the arrow Y direction, respectively. While bottom surface B
It is held so as to be parallel to, and it is possible to smoothly follow the unevenness and the slope of the water bottom surface B.

The mesh portion 4 at the lower side of the bottom opening 10 is formed by vertically stacking a plurality of layers of mesh bodies, and the mesh portion 5 at the side surface portion thereof is a stack of a plurality of mesh bodies in the vertical direction in the lateral direction. I am using the one that has been arranged.

The sand covering device having the above-described structure is provided with a sprinkling box 1 at any time so as to correspond to the actual sand feeding amount of the sand S measured by the separately installed mud content meter and the flow meter and the required spreading thickness. By controlling the moving speed of, it is possible to apply sand covering with any thickness.

In the above embodiment, one pair of diffusion ports 9 for ejecting the slurry of sand S and water is provided on each side of the spray box 1, but a plurality of pairs of diffusion ports 9 can be provided as needed. .

〔The invention's effect〕

As described above, if the sand covering device of the present invention is adopted, the slurries consisting of sand and water respectively jetted from the diffusion ports provided in pairs are sufficiently collided with each other in the spray box. After being agitated and dispersed to a uniform concentration, it slowly softly lands on the bottom of the water by passing through the mesh part, so sludge rises up when covering sand on soft ground such as sludge. There is no problem that the surrounding water is polluted or the sludge and sand are exchanged, and there is an effect that good and efficient sand covering work is performed.

In addition, since the sand covered with sand has a uniform thickness, and the diffusion to areas other than the lower part of the spray box is extremely small, the amount of sand to be sprayed is small, and economical sand covering work can be performed. There is an advantage.

Further, there is also an advantage that by controlling the moving speed of the sprinkling box, it is possible to perform uniform sand-covering work with an arbitrary thickness.

What is particularly effective here is that since a mesh part composed of a plurality of layers of mesh-like material is provided in the lower part and the side part of the bottom opening of the sprinkling box, the slurry composed of sand and water due to the appropriate resistance of the mesh part. It can be softly attached to the bottom of the water, preventing sludge from flying up and swapping sludge with sand cover.

Furthermore, since the mesh part is also provided on the side surface of the bottom opening, it is possible to prevent the influence of water resistance due to the external water flow and the movement of the spray box, and it is also possible to spray the slurry from the side surface, so the spraying area is substantially large. It is possible to improve the spraying efficiency.

[Brief description of drawings]

FIG. 1 is a side view of a sand-covered ship equipped with the sand-covering device of the present invention,
FIG. 2 is a side sectional view of a sand-covering device on the bottom of the water in one embodiment of the present invention, FIG. 3 is a plane sectional view in the II direction of FIG. 2, and FIG. FIG. DESCRIPTION OF SYMBOLS 1 ... A spreading box, 2 ... Sand pipe, 4, 5 ... Mesh part, 6 ... Ladder, 7 ... Sand pipe, 9 ... Diffusion port, 10 ... Bottom opening part, 1
5 ... sand cover boat, B ... bottom surface, H ... distance, S ... sand.

Claims (1)

[Claims] 1. A slurry composed of sand and water from a sand pipe is provided on a side surface of a spreading box which is movably provided by a ladder while maintaining a substantially constant distance from the bottom of the water and has a bottom opening. At least a pair of diffusion ports capable of jetting facing each other are provided, and a mesh portion made up of a net body or the like stacked in multiple stages is provided in the lower part of the bottom opening of the spreading box, and a lateral portion is provided in the lateral direction. A sand-covering device on the bottom of the water, which is provided with a mesh part that is arranged in multiple layers.